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Finding the Fourth Proportional to 157.79, 236.19 and 139.56

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Solution

The fourth proportional to 157.79, 236.19 and 139.56 is: 208.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    157.79 : 236.19 = 139.56 : x
  2. Step 2: Convert to fraction form
    157.79/236.19 = 139.56/x
  3. Step 3: Cross multiply
    157.79x = 236.19 × 139.56
  4. Step 4: Simplify right side
    157.79x = 32,962.68
  5. Step 5: Solve for x
    x = 32,962.68/157.79
  6. Step 6: Final answer
    x = 208.90

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.